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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a8ba54fc56b69315537d561cbf04862f952dc0e204770280d292e357421346' 
  AND token = '0x333qe8UAgyqb6mk3Hnj4LIb6RV0HYrHdQKKP9tQfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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