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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c30028a08d2a98a05cc0f806d8e6b1af7c7aab0a0d3a38a83abfe616a0f9fce' 
  AND token = 'ZJPS1ROzwwgrZUbPs/AQPW7Zj1qp6q3ZMupoPf8z84w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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