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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f58760c9865779a71c9eb8f663f0fe41335df6ccf7101b934aaed290ac4dc6' 
  AND token = 'Rc0o5AVYdWIlrQpqn/kjhlj1j7ua2ixbUdix8vM3nxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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