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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71979c2f04e03b6e897089b1eba25280ff09eb0d3b529b829acfd03dd5b047df' 
  AND token = '7cnFpZwry3zkJX7mVPBWhwHrsq9rZRyvoc373ebWHGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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