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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3507acbb49b57906939a947f868e439c19bf5dafc33ff2a680e577acd1acb85b' 
  AND token = '0pSqJC65ysYikzBR+vHd499eiQHJGwh1ocWPB9xSM5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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