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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9586782142a479ea7910f7855548b27fb9ea70ca77e5c384f13305c0b2f07c1' 
  AND token = 'AIuFqAieA0LQiSI5bLL7EGubxCSEchjzxB4fLBquoVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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