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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeeb8dbe7829955dc22cb66a20e2fd9f48db65a9f46ec7e57d4e86136c0c5a47' 
  AND token = 'dH+Bn1bH9tanwO0rfT1SlWskb81JltbBA8oS1xDL+2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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