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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e0ca6310f3487a1be43a81a5931e8fd73ef6296e777b0e7f74051229725786' 
  AND token = 'Cge/8Sr3+SAX85yGw2HnoXiW4LE7wl02tn/t3odGARo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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