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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2017217648c10b2481d3231be61fb32aa648afd4ca787636a6e3ee4bdec9a7' 
  AND token = 'jLsSH9MWUge33h1I/Gr9sB/Jn7q0+lCkksLV8THKpXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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