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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea745c6d8b982a7249eb03b53060964bce67b153ab942cda1824677aec8c8455' 
  AND token = '64p2TMm9XU4VJJ4fVQos1GkP0l5OTknktCQ95uBW9P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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