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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941a127f79b7320df08feb5dc080f01ea927692553086e3374a1038aa94913c7' 
  AND token = 'DrpwtWM5xiUs4GXIk4NzFoCiXejL+XEwe2DqJv9xKGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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