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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07cbc97ccb92014f46d831f9ac2a9d10b3dfee0dc3a91d9ec6a1a373cd73064' 
  AND token = 'vTZ+CjUZpGvd4T24uCChmQFNJ/v0+m+BZ4WLOX3hW7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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