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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f5bdd234e422f0cd116c7d572bdda9ce90e07ec3742dca34a386a9a8f28209' 
  AND token = '7x15yfwR3w92FkuC5KcZpma3ZU8PUCWkOiSEpzg3J0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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