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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838540bd2a68f95481af0689e761defccdf90f3733a5cebc608482d3ae77a4b0' 
  AND token = '5WbzMZMC0DP8ifKgSLuf4xtqh1YFcWNsYJO6nnrovZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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