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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62371534c5cef34cfced14b7176f6c3d4cd60b05c7c8ba7f4367dc89f9e5304' 
  AND token = 'Mu2ACiavzNShVsaSP7ns/rTct4cidY4sKIekzU/TmnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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