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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f90da25d8eda77b691ee9f049c0251de043d92c54625f20fe2ffad08b742b4' 
  AND token = '86XCYfuqZJu6YO88qApvraLMTZ4gnc19n17LaMD+SVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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