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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0be08df82c772bcd5a3842e87fd526a78f959eabe4004ad11652a0fe8a2822' 
  AND token = 'BWN6V0siqWZi4hH3xEE4lUFj2jlsTct3q7i94Wq8VS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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