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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9f7b2b29ff33afafc87f51b1f261cc74a3602c0626ccf507ac187553b82233' 
  AND token = 'cgfxpk31gv9s4CM0ErUag57EbErw1mc+Q6TPVQCufyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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