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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09aa68aa182f34c775948c63cf07de19e8b0fcafa501dc8d69c1018292913dee' 
  AND token = 'Uh+AnKJZZukxN1JYFhLDbukRgFy9UjuMLOeHJ6g5N98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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