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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93347be5bd74b715ab3a9678911882ab3bc8687709c34c774f7d37696bd800b1' 
  AND token = '8jNDRcudwGCmov8tqTJqrz4qvCnj16Ps5G5QIsZ5PkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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