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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94187317c89181684161e3bc9fdc7947e1eb7f5822539135aa43dbaabf93fbe6' 
  AND token = 'TLYHCIiY8cJEqmbnAT4wuaCu2TLWxHAxr5R+82vfDWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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