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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12615cb162fd36ddae4846f284eff4d5f512d9b72f7fee78016a82c9639447ec' 
  AND token = 'ULW6WLYbNZm013+b4ikJgzfZ8kAg40/WK7o8wUeWKUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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