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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5994998b64b88a278a817b57957b3818a5dc2e30417c4376147d34810e9d5d0' 
  AND token = 'nGR/TZJ3sv8jRvTq43z+NYF75ldc7yFlMZzp93tOtbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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