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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0348283ccc47dfbf674282248bec3d5acae01dbce1b3ebf2a2d97ed5ea93f1' 
  AND token = 'hhhscrDGLUnMoOF2qqIv0GhewqTNosE9Iza90qI4saM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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