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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c201f131267880633f936fe4d1040c5a5603a2193ba1451831f525422e836477' 
  AND token = 'G8vIX2yQJEoOwNA2qgLRqhNsyis7OnI3mgOsrlxUffg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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