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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c3aa14cc847518a89d7befa0aa7a2b6c6b61a68d2fcf28c5230f828e131bba' 
  AND token = 'B9DRXtZCgPr+lvETIr6d28fFyuCxWeeQxtTeTFVZqIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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