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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97f55b2bb98b87cb04a9c8e0091ab8a1e68873a183d5b13d76ca39f3e6c5194' 
  AND token = 'U4r/TXU79ILE3uodcy0ZC1BahPkzocZtz57sBozfc8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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