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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5960584efc48324c0892c02eb7a56528eeca17906e9d34f00a8f1f36215c201b' 
  AND token = '5BFHCKCRhAgqwqmwHzMS0OCDl650O+DWN/ygbpwZ/yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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