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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928704ce51ebee76482d5b04ec14242ed535937f6b7dd637738935c47783873a' 
  AND token = 'HvULjDSqhrDSNfp8JE9iOky6JUMTT47Z4P9cC2NnxXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}