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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7c7475e255aa60e9ab11c06d5dedaffbb752564211036df44c14fccb50f67f' 
  AND token = 'ze9r0y1Qk3rWjT3iZpDq+1S07myjoIjaTQrZ01udgYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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