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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74000048e122f4dab4cff202d75bdc5531716f806030ff13e730ffa323c7f2c0' 
  AND token = 'I6OjrSO4aqbyhhvaP6MIMh1oUIBCTWqw9NYy9Ro2HlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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