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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0fb93d55e4164def49693b7659633bdb08597cc311eab9536861ac2ba2349e' 
  AND token = 'EOOm+JW2LuUfMg5IRXPhiamjkMJQsce815uQXuJ8ZOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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