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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62046c2f50ac5f90bd43a4e46a02029ccf8549115ef09406e40ff0b3f1bc78b1' 
  AND token = 'WCV2zWKXOV+tA4iSSy2+oIu1Zk0BkOYdgF26ft9G3Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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