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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f035fd095df36d685524e9297511d54941cc0db40c641c5293d0329085984a' 
  AND token = 'kDJCxretlrqBzkNPBf7FH56F1rCd380zcd7Wbj7rw9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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