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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1902f1905537783eeafd0f0c918f3682d2cac10d9bd57d3a14f6cf30fdf04ec6' 
  AND token = 'ZMz3JHGWCk5gMe/92ZfDQfLLk+Q0etTDbfb0veB1vgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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