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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa070aee309b2e11dbe546961ab0ff6db315b06df3c09c7e24b64c810d8ac2b3' 
  AND token = 'E9Yk3fBFy77VqYFhDMMamAIonxF6tNTi/z5lyEEgxH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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