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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2e77d061f5042205a9381a199a050717c18222a16b417ae30e683a4a09f955' 
  AND token = '9HvUn7fBJkyztUkAesCCqx74Syxj24O1dq263EnRtIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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