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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bbe709ca54c05c588adca9969706e57f697366a3ec7f81fc8827383fb5e6ca' 
  AND token = 'HQXZvLM1bu7sXSfskgnZPjDNl33HNU2/AaU9q7MBnH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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