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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f33a767ad4a4565c8b3828a73a96496f7305b45ccb52eb29cc1fba12c3dc863' 
  AND token = 'Zyyj0VVu/QUlnrtF3dHJuI/I+Z+SpEz6F1k1koNOUAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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