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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3190f6baa09a7aca56d1819e88f19abcef7acb15be8443ff9cd49c1ea26912' 
  AND token = '2/JYQyLKM0UTE7H6iMDaKQDLu1Nw7l5km1FYG80UUMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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