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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74874cf47513694d7f3bd950a5e9145bbc3092f1fa03e033f973fa10ea9c1f39' 
  AND token = 'SxUj+yjTSUxOs5nWMrlelAEKE5Ms6NxNps6M11acwkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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