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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14c575f6c1da8477ef65555071b589dbbf7dffb2875935d44235701556aa35c' 
  AND token = 'nW9mC/DSsJVMm/LRyl/AHxjP5DZmWtkNYBGRqlIxQ0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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