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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb172719c7deb010beb764cccd9fb765b8c69e200299873b81e058857eb85c96' 
  AND token = 'lRV5FJacCm6/KIN35kj0b6dyr33CDPlmumYLJnhZM9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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