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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94f343c39e5039d86452f0277009009a67f62c4997f0a618ae4041c32bde8bf' 
  AND token = 'exx5mPDHqHlOMVMSfY0+YJ2nJC/7jxh+0l2kuWQjf2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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