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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ea5f874c1b5ff95989a473200de1b5b5bf35b1ef9c0ff1b39e3d37cd5ee9ac' 
  AND token = 'XetquRKy22Qa8EXfr2a9OEOFhGn0Cz3vyHYXULmpR1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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