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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e02c6f85c11fe5c60edd696b8a637ee5d0ea3207c9db5d2a8ab3280fe543b2a' 
  AND token = 'da3ee5FiywUdYNeGNcV24taLZbGnpEdOnAnII8o8m9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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