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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c8c5b31393a2a92f479572ba3936bfe85a4772419724846a666ad565343c4e' 
  AND token = '5A773183K0D2tm3YhlGX2j2MpTT2dPf95oV7cA07q1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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