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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819568006b8144f6af08c46d6ae710618caf35ab9bf082c932b5c94424ff7713' 
  AND token = 'TGQREMbR1kgqUkg6mA6fiTwbvRLY8F8A+WlmhiIBOr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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