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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c3013ace734117be76f7178a69dd384742c054d36dce09d46ac2cd8e62d7e2' 
  AND token = 'SCRBSG9Y7Gg2HLLSjAXGCx9gv640xmVXgBgoQ4+PEXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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