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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7bbfc26599781001e2996e1841a68f5fab0d446bd04eba2dd7a4113a380694' 
  AND token = 'N2D8yBYm4zNj5La6D4N0blgcwOq1Ee1YhgRbJBo/qSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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