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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b9572a882cc97179aa1c86f058f9dcf9b14342c7dbf769465333afa033270a' 
  AND token = 'y097k/x/veqCVxRjDwCxI2Jc6e528VxHt+gXhRbpvak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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