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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87827c937d8a6db5881070a4679597822527f134bc5384b155a3394bf6371b1' 
  AND token = 'MvGYh9rPigOx7noqetC0+xy5KMdOj0vijB28e/1Ab3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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