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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd4eded0bc668ffc34023aff3dae1f5e5ce67b5384315cc0214bd492137ce19' 
  AND token = '8wbPBxPXerE+cdZoYwF+kOpozDjLIfxs+OX1tJiVVI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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