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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd17b15f058d25ecb5b3b446c76a9980f32e8980de8b3361ecf931212a829b5' 
  AND token = 'CN8SP23dgeN3GCEmL6F9T3nMJAQkHS8CCxrkEiIc4w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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