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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136df0a135805373b377d57e3452edf2ff6d71afaf1167f0f797a30d7e309dbe' 
  AND token = '/fJnt3aetuekAjOSgoXQJK35vxfa70Gwqzr71Erq8tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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