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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37690cb91050d6e5c1c989febece163435b4072dc19f40186ab9859518232905' 
  AND token = 'GXh25mrCIBUc1y9h7CVEDNPZKI0v31bbdxYOTCY2ETw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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