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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc85a38c5d192a586b59f3fe169459548497bbcf1cda7c2fe2eeb0071b67b2f' 
  AND token = 'x62Dhk6BFPCAvbNnhkM6kJ2OGD0l9i1IG1AtVSDVFGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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