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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '622308abb7f96b90481a7777ab39eb48f866a608983c9a6d570e8f5a69094596' 
  AND token = 'B3SFA/4DZLBHXuxNAsPLbOYR3N2fASlCHIKoxUHFejM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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