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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8ca0b70d18fa2afa33a2c86d5da028c49985e938657e5eeca7c61d7f602087' 
  AND token = 'Febl3vjDB6lj2xWIoNSt49VCE4dCXY7EnuNyWqBa8g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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