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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5410f884c79c9b21a5485f3123c41a6ceee25fd03b4e99e47a0c76255765aa73' 
  AND token = '5PUlSDtLHavrIANaVsL/rOWGsfyjO+w50CaT4OKBMRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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