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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3ab36c1f92890d705b98736d2e0b572094293b3552d2f93aef378cf6af2c93' 
  AND token = 'JFd8r3oDL0axAsmAz07bjsx8Qb3LmVE4c8QpC6g8roE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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