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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe30a7356cdb93d748f08a19fa879d0a45875fc407226ac108e7ea089d0fc5b' 
  AND token = 'BHqM7gfj0/59r/G3A+skHo/3+J9UmnVu/sUm+Adix9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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