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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070e742b319a438e6448812453de7a677d705dc1c9515b2f8f52eb56dd76030a' 
  AND token = 'PUvzgRlTn5Whscim7gcDZPYVja04aSPNLR3jfr1m9ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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