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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75faee48bd0f125dc9d5be26e3598dfc4eb3b7738ea33fe1c9417db033fa0769' 
  AND token = '9ABZ1grV24TBJp3l/KRAeMaJM3NxyLpCS5FKTQuVd1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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