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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b383edfa6de407d7c3ab859d8a1d60ef0427018311f34c86e5019d2d951f102b' 
  AND token = 'Ncr5BJK6KdobQsb7PlGhS7d2AtuZ6M6lvKd5KFXjlds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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